Sultan, M. . ., and D. . . Hameed. “Effect Similarities Strategy in Classification Skill Development in Science on Basic Fourth Grade (semi-Empirical Study in Lattakia City)”. Tishreen University Journal- Arts and Humanities Sciences Series, vol. 40, no. 4, Nov. 2018, https://journal.tishreen.edu.sy/index.php/humlitr/article/view/4766.